Keywords: Teknisk Elasticitetslære - Pl4-fig33.png Koordinattransformation skew Asger Ostenfeld 1898 Teknisk Elasticitetslære pl 4 fig 33 http //books google com/books id j8MJAAAAIAAJ scanned by google 1898 Asger Ostenfeld 1866 “1931 PD-old-auto-1923 1931 File Teknisk Elasticitetslære djvu Asger Ostenfeld Coordinate systems Complementary angles Linear functions |